This circuit generates sinusoidal signals that depend on the input oscillator. The circuit is from a Radio Elecrtronics from April 1988. The signals are in the range of a few hundred kilohertz.
This dual-LED circuit indicates three signal levels. It was found in the January 1996 issue of...
With this circuit of a Popular Electronics from the 90's it is possible to test a diode with the...
Found in an Electronics World of 1966, this circuit makes use of FETs of the time. Modern...